A Network-Level Perspective

A simplified representation of PI3K–AKT signaling is:

Extracellular signal

↓

Receptor activation

↓

PI3K

↓

PIP2 → PIP3

↓

AKT recruitment and activation

↓

Downstream targets

↓

Cell survival · Growth · Metabolism · Protein synthesis · Proliferation

At the same time:

PTEN

↓

PIP3 regulation

↓

Control of pathway activity

This network perspective helps researchers understand how relatively small molecular events can generate coordinated cellular responses.